Patent GB-986064-A (GB)
Title: Process for forming a corrosion-resistant coating on a water-wetted surface
Inventor: JORDA ROBERT MARTIN
IPC: H01B7/282
Filed: 1962-02-14
Abstract: A composition for forming a corrosion resistant coating on, and/or repairing, a water wetted surface comprises a mixture of a polyepoxide having on an average more than one vic-epoxy group per molecule and containing no groups highly reactive with water, and at least a 5% stoichiometric excess of a material possessing a plurality of amino hydrogen atoms at least two of which are attached to different amino nitrogen atoms, said material having a greater affinity to the surface than the water whereby it replaces the water from the surface to be coated and cures the polyepoxide. The polyepoxides may be saturated, unsaturated, aliphatic, cycloaliphatic, aromatic or heterocyclic and may be substituted with clorine atoms, hydroxyl groups, or ether radicals, and include polyepoxy alkyl ethers of polyhydric phenols and alcohols (lists of suitable compounds given).  The material possessing the amino hydrogen atoms may be aliphatic, cycloaliphatic, aromatic or heterocyclic polyamines and include adducts of mono- or poly-epoxides, unsaturated nitriles or acrylates with polyamines, imidazoline compounds prepared by reacting a monocarboxylic acid and a polyamine, N-(aminoalkyl) piperazines, N-(alkylthiohydroxyalkyl) polyamines, aminoalkyl substituted aromatic hydrocarbons and polyamides (lists of suitable compounds given). Other materials which may be included are silicas, silicates, asbestos, silica aerogels, bentonite, sand, crushed shells and rocks, aluminium, iron, barytes, triphenyl phosphite lamp black, chrome yellow, coal tars, asphalt, middle oil, refined coal tars, pine tars and oils, phenol-aldehyde resins phenol-urea resins, polythiopolymercaptans vinyl resins, polyolefins, synthetic rubbers and polyamides.  Specification 730,760 is referred to.ALSO:A process for forming a corrosion resistant coating on, and/or repairing, a water wetted surface comprises applying thereto a mixture of a polyepoxide having on an average more than one vic-epoxy group per molecule and containing no groups highly reactive with water, and at least a 5% stoichiometric excess of a material possessing a plurality of amino hydrogenatoms (i.e. a plurality of hydrogen atoms at least two of which are attached to different amino nitrogen atoms), said material having a greater affinity to the surface than the water whereby it replaces the water from the surface to be coated and cures the polyepoxide, and allowing the mixture to harden.  The polyepoxides may be saturated, unsaturated, aliphatic, cycloaliphatic, aromatic or heterocyclic and may be substituted with chlorine atoms, hydroxyl groups, or other radicals, and include polyepoxy alkyl ethers of polyhydric phenols and alcohols (lists of suitable compounds given). The material possessing the amino hydrogen atoms may be aliphatic, cycloaliphatic, aromatic or heterocyclic polyamines and include adducts of mono- or polyepoxides, unsaturated nitriles or acrylates with polyamines, imidazoline compounds prepared by reacting a monocarboxylic acid and a polyamine, N-(aminoalkyl) piperazines, N-(alkylthiohydroxyalkyl) polyamines, aminoalkyl substituted aromatic hydrocarbons and polyamides (lists of suitable compounds given).  Other materials which may be included are silicas, silicates, asbestos, silica aerogels, bentonite, sand, crushed shells and rocks, aluminium, iron, barytes, triphenyl phoshpite, lamp black, chrome yellow, coal tars, asphalt, middle oil, refined coal tars, pine tars and oils, phenolaldehyde resins, phenol-urea resins, polythiopolymercatpans, vinyl resins, polyolefins, synethetic rubbers and polyamides.  The surfaces to be treated include wood, cement, plaster, glass, copper, aluminium, brass, steel and iron. Articles specified are pipes, boats, pilings, reaction vessels, structural members of oil well drilling platforms, well jackets and heat exchange tubes.  The surfaces may be cleaned with organic solvents and by steel brushing, acid etching or sand blasting before coating, and heated after coating. Specification 730,760 is referred to.ALSO:A process for forming a corrosion resistant coating on, and/or repairing, a water wetted surface comprises applying thereto a mixture of a polyepoxide having on an average more than one vic-epoxy group per molecule and containing no groups highly reactive with water, and at least a 5% stoichiometric excess of a material possessing a plurality of amino hydrogen atoms (i.e. a plurality of hydrogen atoms at least two of which are attached to different amino nitrogen atoms), said material having a greater affinity to the surface than the water whereby it replaces the water from the surface to be coated and cures the polyepoxide, and allowing the mixture to harden.  The polyepoxides may be saturated, unsaturated, aliphatic, cycloaliphatic, aromatic or heterocyclic and may be substituted with chlorine atoms, hydroxyl groups, or ether radicals, and include polyepoxy alkyl ethers of polyhydric phenols and alcohols (lists of suitable compounds given). The material possessing the amino hydrogen atoms may be aliphatic, cycloaliphatic, aromatic or heterocyclic polyamines and includes adducts of mono- or poly-epoxides, unsaturated nitriles or acrylates with polyamines, imidazoline compounds prepared by reacting a monocarboxylic acid and a polyamine, N-(aminoalkyl) piperazines, N-(alkylthihydroxyalkyl) polyamines, aminoalkyl substituted aromatic hydrocarbons and polyamides (lists of suitable compounds given). Other materials which may be included are silicas, silicates, asbestos, silica aerogels, bentonite, sand, crushed shells and rocks, aluminium, iron, barytes, triphenyl phosphite, lamp black, chrome yellow, coal tars, asphalt, middle oil, refined coal tars, pine tars and oils, phenolaldehyde resins, phenol-urea resins, polythiopolymercaptans, vinyl resins, polyolefins, synthetic rubbers and polyamides.  The surfaces to be treated include wood, cement, plaster, glass, copper, aluminium, brass, steel, and iron. Articles specified are pipes, boats, pilings, reaction vessels, structural members of oil well drilling platforms, well jackets and heat exchange tubes.  The surfaces may be cleaned with organic solvents and by steel brushing, acid etching or sand blasting before coating, and heated after coating.  Specification 730,760 is referred to.